延迟成胶弹性硅酸凝胶堵水剂及其性能研究  

A delayed gelation elastic silicic acid gel water plugging agent and its performance

作　　者：贺杰[1] 刘航瑞 陈庆梅 杨超越[2] 叶子 HE Jie;LIU Hang-rui;CHEN Qing-mei;YANG Chao-yue;YE Zi(Oil&Gas Field Applied Chemistry Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Research Institute of Natural Gas Technology,Southwest Oil&Gas-field Company,CNPC,Chengdu 610500,China)

机构地区：[1]西南石油大学化学化工学院,四川省油气田应用化学重点实验室,四川成都610500 [2]中国石油西南油气田分公司天然气研究院,四川成都610500

出　　处：《应用化工》2024年第4期769-773,共5页Applied Chemical Industry

基　　金：国家自然科学基金资助(51704250)。

摘　　要：针对现有硅酸凝胶堵水剂普遍存在成胶时间短、成胶后脆性大的问题,结合L油田油藏条件,通过考察活化剂类型及用量,弹性改善剂类型及用量,以及水玻璃用量对成胶时间和弹性模量的影响,得出了一种延迟成胶弹性硅酸凝胶堵水剂。其配方为:6%水玻璃+0.85%活化剂三元弱酸一铵GL-1+0.1%弹性改善剂正电胶,该配方在油藏温度65℃下,成胶强度达到E级的时间为72 h,成胶后的弹性模量为589.46 Pa。采用填砂管实验评价了堵水剂的注入性及封堵性,结果表明堵水剂在L油田中具有良好的注入性及封堵性,在渗透率为1168.06×10^(-3)~5061.57×10^(-3)μm^(2)的填砂管中,注入0.8 PV的最高注入压力仅有0.72 MPa,封堵率均>96%。该堵水剂可用于L油田的油井堵水。The silicic acid gel water plugging agent often has short gelation time and high brittleness after gelation.To address this issue,a delayed gelation elastic silicic acid gel water plugging agent was developed in combination with the reservoir conditions of L oilfield,the type and dosage of activator,the type and dosage of elasticity improver,and the effect of sodium silicate dosage on gelation time and elastic modulus were examined.The injectivity and plugging ability of the plugging agent were evaluated using a sand-filled tube experiment.The results showed that the optimal formulation was:6% sodium silicate,0.85% activator ternary weak acid monoammonium GL-1 and 0.1% elasticity improver mixed meter hydroxide.At the reservoir temperature of 65 °C,the gelation strength reaches grade E after 72 h,and the elastic modulus after gelation was 589.46 Pa.The highest injection pressure for injecting 0.8 PV was only 0.72 MPa in the sand-filled tube with permeability of 1 168.06×10^(-3)~5 061.57×10^(-3)μm^(2),and the plugging rate was more than 96%.This study suggests that the water plugging agent had good injectivity and plugging ability and could be used for the L oilfield.

关 键 词：油井堵水 延迟成胶 弹性硅酸凝胶 堵水剂 注入性及封堵性 

分 类 号：TQ17[化学工程—硅酸盐工业]